U >> reader.root_object["/PageLabels"]["/Nums"] [0, IndirectObject(18, 0, 139929798197504), 8, IndirectObject(19, 0, 139929798197504)] >>> reader.get_object(reader.root_object["/PageLabels"]["/Nums"][1]) {'/S': '/r'} >>> reader.get_object(reader.root_object["/PageLabels"]["/Nums"][3]) {'/S': '/D'} Example 2 --------- The following is a document with pages labeled i, ii, iii, iv, 1, 2, 3, A-8, A-9, ... 1 0 obj << /Type /Catalog /PageLabels << /Nums [ 0 << /S /r >> 4 << /S /D >> 7 << /S /D /P ( A- ) /St 8 >> % A number tree containing % three page label dictionaries ] >> ... >> endobj §12.4.2 PDF Specification 1.7 and 2.0 ===================================== Entries in a page label dictionary ---------------------------------- The /S key: D Decimal Arabic numerals R Uppercase Roman numerals r Lowercase Roman numerals A Uppercase letters (A to Z for the first 26 pages, AA to ZZ for the next 26, and so on) a Lowercase letters (a to z for the first 26 pages, aa to zz for the next 26, and so on) )IteratorListOptionalTuplecast)PdfCommonDocProtocol)logger_warning) ArrayObjectDictionaryObject NullObject NumberObjectis_null_or_nonenumreturnc sHddddddddd d d d d g tttdfdd }dt||S)N)iM)iZCM)iD)iZCD)dC)ZZXC)2L)(ZXL) X) ZIX)V)ZIV)rIrc3sBD]8\}}t||\}}||V|||8}|dkrq>qdS)Nr)divmod)rdecimalZ roman_reprx_Zroman6/tmp/pip-unpacked-wheel-wu2fni14/pypdf/_page_labels.py roman_num[s    z1number2uppercase_roman_numeral..roman_num)intrstrjoinlist)rr(r&r%r'number2uppercase_roman_numeralJs r.)numberrcCs t|SN)r.lowerr/r&r&r'number2lowercase_roman_numeralfsr3cCsv|dkrtdddttdtddD}d}|dkrr|d }|dkrPd }||d|}||8}|d }q4|S) NrzExpecting a positive numbercSsg|] }t|qSr&)chr).0ir&r&r' msz+number2uppercase_letter..AZrr)) ValueErrorrangeord)r/alphabetrep remainderr&r&r'number2uppercase_letterjs  rAcCs t|Sr0)rAr1r2r&r&r'number2lowercase_letterzsrB)dictionary_objectindexrc Cstt|d}d}d}d}|t|krl||}||d}|dt|krPql||d|krbql|d7}qddddttttd}t|t st |dS| d d}| d d }||| d |||S) N/NumsrrcSsdS)Nr)r&nr&r&r'z%get_label_from_nums..cSst|Sr0)r+rGr&r&r'rIrJ)Nz/Dz/Rz/rz/Az/az/Stz/Pr)z/S) rr len get_objectr.r3rArB isinstancedictr+get) rCrDnumsr6value start_indexmstartprefixr&r&r'get_label_from_nums~s0      rV)readerrDrcCstt|j}d|kr t|dStt|d}d|krDt||Sd|krt|dtsd}|dkrttt|d}|D]t}ttt |d}|d|kr|dkr|nq|t | dds|d7}|dkrt d |}q^t||Sq|qq^t d |d tt|dS) z See 7.9.7 "Number Trees". Args: reader: The PdfReader index: The index of the page Returns: The label of the page, e.g. "iv" or "4". z /PageLabelsrrEz/Kidsrrz/LimitsNz"Too deep nesting is not supported.z,Could not reliably determine page label for .)rr Z root_objectr+rLrVrMr rr*rrONotImplementedErrorr __name__)rWrDrootZ number_treelevelZkidsZkidZlimitsr&r&r' index2labels2    r]N)keyrQrPrcCst|ddkrtdt|}|dkrB|||dkrB|d}q |t|krh|||krh|||d<n|||||d|dS)z Insert a key, value pair in a Nums array. See 7.9.7 "Number Trees". Args: key: number key of the entry value: value of the entry nums: Nums array to modify rFr6A nums like array must have an even number of elementsrN)rKr;insert)r^rQrPr6r&r&r' nums_inserts  ra)r^ page_index_torPrcCsht|ddkrtd||kr(td||d}|t|krd|||krd||||q6dS)a Remove all entries in a number tree in a range after an entry. See 7.9.7 "Number Trees". Args: key: number key of the entry before the range page_index_to: The page index of the upper limit of the range nums: Nums array to modify rFrr_z/page_index_to must be greater or equal than keyN)rKr;rDpop)r^rbrPr6r&r&r'nums_clear_ranges rd)r^rPrcCsNt|ddkrtd||d}|t|krF||||dfSdSdS)z Return the (key, value) pair of the entry after the given one. See 7.9.7 "Number Trees". Args: key: number key of the entry nums: Nums array rFrr_r)NNN)rKr;rD)r^rPr6r&r&r' nums_next s  re)__doc__typingrrrrrZ _protocolsr_utilsr Zgenericr r r r rr*r+r.r3rArBrVr]rardrer&r&r&r's0<   $2